An interruption of the water supply system caused by an earthquake will disturb an efficient use of building functions. Especially, the center of the administrations must keep these functions. This study deals with the Kasumigaseki district and investigates the following 4 issues. 1) Research and analysis of the water supply system of the government institutional buildings located in the Kasumigaseki district. 2) Case study on the possibility of keeping building functions of when the water supply is interrupted. 3) Investigates the method for keeping building functions, for example, renewal the water supply system in the buildings, introduction of a water supply system against earthquake disasters, etc. 4) Investigates the possibility of the practical use of the canal water around the Imperial Palace as water supply for refugees around the Kasumigaseki district.
